See if the protective surface is intact. Most parts are factory coated with a protective layer. Such as piston pin, bearing bush with paraffin protection, piston ring. The surface of the cylinder liner is coated with anti-rust oil and wrapped with wrapping paper. The valve, piston, etc. are immersed in anti-rust oil and then packaged in plastic bags. If the seal is damaged when you purchase it. The wrapping paper is missing. Anti-rust oil or paraffin is lost. Should be returned. See if the glued parts are loose. Parts made up of two or more parts. Parts are press-fitted, glued or welded, and no looseness is allowed between them. For example, the oil pump plunger and the adjusting arm are combined by press fitting, the clutch driven and the steel sheet are riveted, the friction plate and the steel sheet are riveted or glued, and the paper filter element skeleton and the filter paper are glued. Made of. The wire ends of electrical equipment are welded. If looseness is found during purchase, it should be exchanged. See if the rotating parts are flexible When you purchase the rotating parts assembly such as the oil pump, turn the pump shaft by hand and feel flexible and free from sticking. When purchasing a rolling bearing, one hand supports the inner ring of the bearing, and the other hand rotates the outer ring, and the outer ring should be able to rotate quickly and freely. Then gradually stop. If the rotating parts do not rotate, it indicates internal corrosion or deformation, so do not buy. See if there are any missing parts in the assembly. Regular assembly parts must be complete to ensure smooth assembly and normal operation. If some small parts on some assembly parts are missing, the assembly parts will not work or even be scrapped. See if the assembly marks are clear. To ensure that the assembly relationship of the fittings meets the technical requirements, the assembly marks are engraved on the surface of some parts (such as timing gears). If there is no mark or the mark is illegible, it will bring great difficulties to the assembly, even if it is wrong. Look at the surface of the mating surface. If there is any wear mark on the surface of the mating part, or if the painted part is peeled off, the old paint is found. Most of them are disguised as scraps, and can be returned at this time. See if the surface hardness is up to standard. The surface hardness of each fitting has the specified requirements. After confirming the purchase and negotiating with the merchant, the steel saw blade can be used for trial shooting. Scratch and scratch without scratches, indicating high hardness, slightly higher hardness after scratching, and obvious marks after the stroke. Indicates that the hardness is low (note that the test surface should not be damaged when the test is performed).
See if the trademark logo is complete. The quality of the outer packaging of the original auto parts is good. The box has clear writing and clear color. The box and bag should be marked with the product name, specification and model, quantity, registered trademark, factory name and telephone number. Some manufacturers also put their own marks on the accessories. Some important components such as generators, distributors, fuel injection pumps, etc., are also equipped with instructions for use. Certificate of compliance and inspector. To guide users to use maintenance properly. Care should be taken when purchasing, in case of buying fake and shoddy products. Look at the geometric size with or without deformation Some automotive parts are subject to manufacturing, transportation, improper storage, and are prone to deformation. When inspecting, roll the shaft part along the glass plate one turn. Look at the contact between the parts and the glass plate to see if there is any light leakage to judge whether it is bent. When purchasing the clutch disc or the friction plate, the steel piece and the friction plate can be lifted in front of the eyes to observe whether it is warped. When purchasing the oil seal, the oil seal end face with the skeleton should be rounded, can be fitted with the flat glass without deflection, and the outer edge of the non-frame oil seal should be straight. Hold it with your hand and deform it. After you release it, you should be able to return to its original shape. When purchasing various types of gaskets, you should also check the geometry and shape. See if the joint parts are flat. During the handling and storage of the automobile parts, due to vibration and bumps, burrs are often generated at the joints. Indentations, breakage or cracks affect the use of parts. Pay attention to check when purchasing. Look at the surface of the part for rust. Qualified parts have a certain degree of precision and a bright finish. The more important the parts, the higher the accuracy. The stricter the anti-rust and anti-corrosion of packaging. Pay attention to check when purchasing. If the parts are found to have rust spots, mold spots or rubber pieces are cracked. Losing flexibility. Or the surface of the journal has obvious turning pattern. Should be exchanged.
In the five functions of management, the main problem involved in staffing is people. Therefore, it plays an extremely important role in the entire management process. Expressed as:
1. Staffing is a guarantee of the organization of effective activities.
The determination of the organizational goals is to clarify the direction of the work, and the establishment of the organizational structure provides the organization with the conditions to achieve the goals. However, to truly achieve organizational goals, we must rely on the most important factor in the organization - people, no one's organization is a static structure without any vitality, any function, it is impossible to talk about guidance and leadership and effective control. People are the most important resource in the organization with great potential.
The most important of all the people in the organization are those in charge. The basic task of the supervisor is to design and maintain an environment in which people in the work can work together within the organization to accomplish the intended mission and goals. It can be seen that the supervisors play a pivotal role in the entire management process, and the supervisors are the key figures in the effectiveness of the organization's activities. Therefore, effectively equipping organizations with executives at all levels is one of the best guarantees for the effectiveness of organizational activities. Organizations at the national level, as small as a specific enterprise or institution, and the properness of the staffing are closely related to the rise and fall of the organization.
2. Staffing is the preparation for organizational development.
Another important aspect of staffing is the preparation of the executives needed to engage in organizational activities in a complex and volatile environment. As pointed out in the planning work, the plan is for the future situation, and the future situation is not certain. The future executives must be able to face the society well and adapt to the increasing use of advanced technology applications. The impact of changes in the external environment and the complex changes it causes to the internal activities of the organization. Therefore, as with other management functions, staffing should have an open system approach. Focusing on the future, it is necessary to adopt appropriate and appropriate methods according to specific situations to properly and effectively select, train and evaluate competent personnel to meet Organize the future needs of executives.
1. Staffing is a guarantee of the organization of effective activities.
The determination of the organizational goals is to clarify the direction of the work, and the establishment of the organizational structure provides the organization with the conditions to achieve the goals. However, to truly achieve organizational goals, we must rely on the most important factor in the organization - people, no one's organization is a static structure without any vitality, any function, it is impossible to talk about guidance and leadership and effective control. People are the most important resource in the organization with great potential.
The most important of all the people in the organization are those in charge. The basic task of the supervisor is to design and maintain an environment in which people in the work can work together within the organization to accomplish the intended mission and goals. It can be seen that the supervisors play a pivotal role in the entire management process, and the supervisors are the key figures in the effectiveness of the organization's activities. Therefore, effectively equipping organizations with executives at all levels is one of the best guarantees for the effectiveness of organizational activities. Organizations at the national level, as small as a specific enterprise or institution, and the properness of the staffing are closely related to the rise and fall of the organization.
2. Staffing is the preparation for organizational development.
Another important aspect of staffing is the preparation of the executives needed to engage in organizational activities in a complex and volatile environment. As pointed out in the planning work, the plan is for the future situation, and the future situation is not certain. The future executives must be able to face the society well and adapt to the increasing use of advanced technology applications. The impact of changes in the external environment and the complex changes it causes to the internal activities of the organization. Therefore, as with other management functions, staffing should have an open system approach. Focusing on the future, it is necessary to adopt appropriate and appropriate methods according to specific situations to properly and effectively select, train and evaluate competent personnel to meet Organize the future needs of executives.
In order to properly and effectively equip the required personnel according to the number and requirements of the positions required by the organizational structure, the following important staffing principles must be adhered to.
(1) The principle of choosing people
The so-called selection of people by reason means that all types of personnel who meet the standards should be selected according to the actual requirements of the positions and jobs. The purpose of selecting a person is to enable him to assume a certain position and to perform the work corresponding to the position as required. In order for the work to be completed satisfactorily and effectively, it is first required to arrange and set up positions under the premise of ensuring work efficiency, and secondly, the personnel occupying the position should have corresponding knowledge and work ability. Therefore, choosing people is the basic requirement for personnel matching, and it is also the first principle of staffing in the organization.
(2) Principles for the use of materials
The so-called use of materials refers to the work of arranging different requirements according to the different abilities and qualities of people. From the perspective of people in the organization, only by arranging work according to the characteristics of people can the full potential of people be fully utilized, and the enthusiasm of people's work can be stimulated to the maximum extent. If the school is not used, oversized or small, it will not only seriously affect the efficiency of the organization, but also cause the failure of the human resources plan.
(3) The principle of employing people
The so-called employer's strength means that when you use people, you can't ask for full blame. Managers should pay attention to the strengths of people. In reality, because people's knowledge, ability, and personality development are unbalanced, the task requirements in the organization are diverse. Therefore, the "generalist" and "all-round" in the full sense do not exist, even if they exist. Organizations do not have to choose to use this "generalist", but should choose the candidate that best suits the vacant position requirements. Effective management is to be able to take advantage of people's strengths and minimize their weaknesses.
(4) Principle of dynamic balance
Organizations in a dynamic environment are constantly changing and developing. The requirements of the organization for its members are also constantly changing. Of course, the ability and knowledge of people at work are constantly improving and enriching. Therefore, the coordination of people and things requires constant coordination and balance. The so-called dynamic balance is to make those who have sufficient ability to develop more important work in the organization, but also to make the ability and the people who do not meet the needs of the position to be identified and reasonably adjusted, and ultimately to achieve people and positions, The dynamic balance of work.
(1) The principle of choosing people
The so-called selection of people by reason means that all types of personnel who meet the standards should be selected according to the actual requirements of the positions and jobs. The purpose of selecting a person is to enable him to assume a certain position and to perform the work corresponding to the position as required. In order for the work to be completed satisfactorily and effectively, it is first required to arrange and set up positions under the premise of ensuring work efficiency, and secondly, the personnel occupying the position should have corresponding knowledge and work ability. Therefore, choosing people is the basic requirement for personnel matching, and it is also the first principle of staffing in the organization.
(2) Principles for the use of materials
The so-called use of materials refers to the work of arranging different requirements according to the different abilities and qualities of people. From the perspective of people in the organization, only by arranging work according to the characteristics of people can the full potential of people be fully utilized, and the enthusiasm of people's work can be stimulated to the maximum extent. If the school is not used, oversized or small, it will not only seriously affect the efficiency of the organization, but also cause the failure of the human resources plan.
(3) The principle of employing people
The so-called employer's strength means that when you use people, you can't ask for full blame. Managers should pay attention to the strengths of people. In reality, because people's knowledge, ability, and personality development are unbalanced, the task requirements in the organization are diverse. Therefore, the "generalist" and "all-round" in the full sense do not exist, even if they exist. Organizations do not have to choose to use this "generalist", but should choose the candidate that best suits the vacant position requirements. Effective management is to be able to take advantage of people's strengths and minimize their weaknesses.
(4) Principle of dynamic balance
Organizations in a dynamic environment are constantly changing and developing. The requirements of the organization for its members are also constantly changing. Of course, the ability and knowledge of people at work are constantly improving and enriching. Therefore, the coordination of people and things requires constant coordination and balance. The so-called dynamic balance is to make those who have sufficient ability to develop more important work in the organization, but also to make the ability and the people who do not meet the needs of the position to be identified and reasonably adjusted, and ultimately to achieve people and positions, The dynamic balance of work.
Exhaust of injection molds is a problem that cannot be ignored in mold design. Poor exhaust gas can cause numerous problems, such as: porosity, voids, charring, air bubbles, surface silver streaks, and obvious weld lines.
There are several sources of gas accumulated in the mold:
1. The air stored in the feed system and cavity.
2. The water vapor generated by the evaporation of water contained in plastic at high temperatures.
3. Gas produced by decomposition of plastics.
4. Some additives in plastic volatilize or chemically reflect the generated gas
5. Inclusion of air and moisture in the feed!
The basic design points can be summarized as follows:
1. The exhaust should be ensured quickly and completely, and the exhaust speed should be compatible with the filling speed;
2. The venting groove should be opened as much as possible in the thick molding part of the rubber parts;
3. The exhaust groove should be placed on the parting surface as much as possible;
4. The exhaust trough should be located as far as possible at the end of the stream and at the confluence, such as the end of the cold well;
5. For the convenience of mold manufacturing and mold cleaning, the exhaust groove should be placed on the side of the die as much as possible;
6. The direction of the exhaust groove should not face the operation surface to prevent leakage of material during injection molding;
7. The exhaust vent should not have an * angle to prevent accumulation of cold material;
8. The size of the exhaust groove must be suitable (generally about 0.2-0.3mm), according to the specific materials and product requirements to select processing, try to avoid causing flash.
Common forms of exhaust are:
Exhaust tank or hole exhaust
2. Partition surface exhaust
3. Inserting slits and exhausting
4. Push rod or thimble clearance exhaust
5. Powder sintered alloy block exhaust
6. Set the exhaust rod to force the exhaust
7. Apply vacuum exhauster to achieve active exhaust and complete exhaust.
8. Die exhaust steel, exhaust plug and other exhaust
There are several sources of gas accumulated in the mold:
1. The air stored in the feed system and cavity.
2. The water vapor generated by the evaporation of water contained in plastic at high temperatures.
3. Gas produced by decomposition of plastics.
4. Some additives in plastic volatilize or chemically reflect the generated gas
5. Inclusion of air and moisture in the feed!
The basic design points can be summarized as follows:
1. The exhaust should be ensured quickly and completely, and the exhaust speed should be compatible with the filling speed;
2. The venting groove should be opened as much as possible in the thick molding part of the rubber parts;
3. The exhaust groove should be placed on the parting surface as much as possible;
4. The exhaust trough should be located as far as possible at the end of the stream and at the confluence, such as the end of the cold well;
5. For the convenience of mold manufacturing and mold cleaning, the exhaust groove should be placed on the side of the die as much as possible;
6. The direction of the exhaust groove should not face the operation surface to prevent leakage of material during injection molding;
7. The exhaust vent should not have an * angle to prevent accumulation of cold material;
8. The size of the exhaust groove must be suitable (generally about 0.2-0.3mm), according to the specific materials and product requirements to select processing, try to avoid causing flash.
Common forms of exhaust are:
Exhaust tank or hole exhaust
2. Partition surface exhaust
3. Inserting slits and exhausting
4. Push rod or thimble clearance exhaust
5. Powder sintered alloy block exhaust
6. Set the exhaust rod to force the exhaust
7. Apply vacuum exhauster to achieve active exhaust and complete exhaust.
8. Die exhaust steel, exhaust plug and other exhaust